This year I have stock Short-Term losses and Long-Term gains. Can I write short-term losses against long gains? Also, do short-term stock losses carry into next years?

Hello - I have a tax question an would appreciate it if someone could get back to me: This year I will have Short-Term stock losses and Long-Term stock gains. I will finish the year with more short-term stock losses and would like to use those losses to write against my Long-Term stock gains. Is this possible? Also, do short-term stock losses carry into next years? Thanks.